MK>DL>MK>any  help/info. on how to connect two terminal node controllers
MK>together
MK>DL>MK>via rs-232/rs-432/mil-188 protocol would be great.
MK>DL>Whew.  Once upon a time I had a Burr Brown controller (for machine
MK>DL>control purposes) that ran with the RS432 and someone gave me an offer 

MK>DL>couldn't refuse before I completed a similar conversion project.
MK>very curios what the burr brown controller for machine purposes is
In (very) short, it's a digital control to analog controller kinda
thingie.  Ya take yer pooter and you command the Burr Brown unit to
control a machine, but it's not like a PLC (programmable logic
controller, which is basically digital to digital because it largely
uses virtual relay ladders).  Industrial production stuff.
MK>DL>It was eons ago and I've got my notes on it buried somewhere, but what 

MK>DL>do remember is that mailorder component suppliers like Newark sell
MK>DL>integrated circuit chips that will convert just about anything to just
MK>DL>about anything else, even ASCII-to-IBM Selectric conversons, if you can
MK>will try calling mouser or digikey with questions. of course next
It's been years, but the last time I looked, Digikey had limited its
catalogue of chips to those which were extremely popular & they could
sell alot of.  Newark, Hamilton-Avenet, and such like that are
industrial parts suppliers which explains why they still have some
incredibly ancient techology stuff even in this day and age.  :)
They will even sell ya 1 of something...but it could be that you might
have a rough time just picking up their catalogues from just any ole
where.  There's a local company that also does mail order, and so I'll
give you the address, minus the zipcode (pulled it out of the phone book
here), and you might want to write to 'em if you strike out elsewhere:
                     Circuit Specialists
                     220 S. Country Club Dr.
                     Mesa  AZ   85???
MK>problem would be to get the chip to convert to the right freq tones.
MK>best way to do it would probably be to use one of those dsp tnc's
MK>that have programmable mark/space on send and receive. the pk-232
MK>has adjustable mark space frequencies on the potentiometer but
MK>i suspect the filters on receive will not work right. will call aea
MK>if all modes had same mark space freq. i think it would work.
Well, you could do that IF.   However, if the chip does a direct
translation to milspec, you won't have to even worry about that...and
even if it doesn't claim to match milspec, there's a better than average
chance that the commercial version will work anyway.
MK>DL>Also, in most good university tech libraries, you can find the details
MK>DL>that establish just about any ANSI, ASCII, SECS, IEEE standards, which,
MK>DL>in many cases, are identical to milspecs.  The usual differences 
tween
MK>harris radio says their radios are rs-232 compatable but....they write
MK>their own protocol..real tricky ...in this application...plain rs-232
MK>i think....i'll tell yah all about my project if ur interested
MK>i think it is pretty neat.
Protocol is different from the RS232 standard anyway...BTW, the SECS
standard is what could be called an RS232 protocol, for example, because
it doesn't concern itself with mark/space/data frequencies and voltage
levels but with how blocks of data via the RS232 ports are handled.
Could be what they refer to is an in-house version of what SECS does
for industrial control communication.
And it's probably copyright protected.   :(
                                73 73's,
                                Diane
                                KC7LJG
 * SLMR 2.1a * He who laughs last has probably made a backup.
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